Means for removing dust.



No. 821,776. PATENTED MAY 29, 1906.

C. F. W. ZULLER.

MEANS FOR REMOVING DUST. APPLIGATION FILED JUNE 28, 1905.

UNITED sTArEs PATEN rricn CARL FRIEDRICH WOLFGANG fzoLLER, or ALTONMOTTENSEN, GERMANY, AssiGNoa rornn FIRM OFALFRED GUTMANN ACTIEN GESELLSGHAFT FUR MAsGHINENBAU, or ALTONA-OTTENSEN, GERMANY.

MEANS FOR REMOVING DUST- Specification ofLetters Patent.

Patented May 29, 1906.

Application filed June 28,1905. Serial NoIZB'YAZO.

In cleaning as hitherto carried out by means of a free jet (a sand-jet) inclosed work chambers or rooms a great defect has been that even high work rooms or halls have been filled with dust to such an extent that even after the work had proceeded for but a short time it was found impossible to con tinue it. This defect is especially noticeable in what are termed cleaning-houses, in which the dustis drawn out through the grating-like'fioor of the house or chamber by means of an exhauster, while throu h roof -open ings, uniformly distributed throughout the roof, fresh air is supplied. This method does not, however, succeed in obviating the said defect, the reason for this being, as careful experiments have now demonstrated, that in the first place owing to a displacement of air throughout the entire chamber the dust coming from {the article cleaned with the free jet and from the jet itself is distributed throughout the chamber and increases according to the increase in size of the article treated, and in the second place because owing to the size of the chamber and to the cost only a relatively small displacement of air can be created which is insuf'licient to speedily carry away the large mass of dust produced. In addition to this the dust drawn through the bottom grating mixes with the sand em ployed for cleaning unless special steps are taken to prevent this, as this sand is usually allowed to fall-through the grating also in order that it may be reconducted to the sandjet apparatus. A recognition of these defects in removal of dust as hitherto carried out formed the basis for the present invention,

- which consists, broadly, in conducting air at high pressure through one or more zones only of the cleaning-chamber, thereby creating one or more through-currents of air and not merely an exhaustion of air, the'said air current or ,currents being directed to pass the operative and above the article to be cleaned.

A cleaning house or chamber constructed in accordance with this invention is shown on the accompanying sheet of drawings, and described hereinafter by way of example.

Figure 1 is a vertical, and Fig.2 a horizontal, sectional view of a cleaning-house made in accordance with and embodying the invention.

Similiar characters refer to similar parts throughout both the views.

The two walls 1 and 2 of the cleaningchamber between which the work place-that is to say, the'place for the article 3 to be cleanedand the stand 4 for the operative are provided with two oppositely-situated openings (1 and (1 which are preferably arranged at such a height that a current of air passing in the direction of the arrows from one opening to the other or from one set of openings to the other passes beside the operative at a lower level than his respiratory organs and above the highest article treated. Outside the opening a is fitted a socket b, which by means of a pipe 0 is connected with a powerful air-exhauster, by means of which air may be sucked through the zone of the cleaning-chamber situated between the aforesaid openings in order to carry all the dust from this zone to the exterior. I

In front of the air-exhauster a dust-filter consisting either of'a mechanical filter or a water-bath may be arranged in the known manner in order to protect the exhauster from dust. In the-known manner likewise the floor at of the chamber may be perforated, and beneath it may be mounted a conveyor-worm 6, leading to an elevator in order to reconduct the used sand which falls through the floor back to the sand-jet apparatus.

In place of sucking the air through the chamber it may be forced through it; but

forcing is less advantageous than suction.

In accordance with the novel process, therefore, a current of airthat is to say, an air-bearing stratum is produced only where the removal of the dust is required, and it does not entail any dilliculty or considerable cost to impart a very high velocity to this air current or air stratum, and by this means the dust is certainly removed from the zone traversed by the current. The operative may be protected from drafts bymeans of suitable clothing-for example, by means of a headcovering extending down the neck.

Having fully described my invention, What I claim, and desire to secure by Letters Patent, is

A device of the character specified, comprising a chamber having openings in the Walls arranged opposite to one Another, means for mounting an article to be cleaned below said openings, a perforatedfloor in said chamber, a free sand-jet in the latter, and an air-exhaust in communication with one set of openings for the purpose of establishing an CARL FRIEDRICH WOLFGANG ZiiLLER.

Witnesses:

MAX LEMOKE, ERNEST H. L. MUMMENHOFF. 

